30290640 has 40 divisors (see below), whose sum is σ = 93901728. Its totient is φ = 8077440.

The previous prime is 30290639. The next prime is 30290641. The reversal of 30290640 is 4609203.

It is an interprime number because it is at equal distance from previous prime (30290639) and next prime (30290641).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 30290640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30290641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62866 + ... + 63345.

Almost surely, 2^30290640 is an apocalyptic number.

30290640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30290640 is an abundant number, since it is smaller than the sum of its proper divisors (63611088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30290640 is a wasteful number, since it uses less digits than its factorization.

30290640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126227 (or 126221 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 30290640 is about 5503.6933054087. The cubic root of 30290640 is about 311.7234564682.

Adding to 30290640 its reverse (4609203), we get a palindrome (34899843).

The spelling of 30290640 in words is "thirty million, two hundred ninety thousand, six hundred forty".