70657440 has 192 divisors, whose sum is σ = 269547264. Its totient is φ = 15187968.

The previous prime is 70657429. The next prime is 70657507. The reversal of 70657440 is 4475607.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56502 + ... + 57738.

It is an arithmetic number, because the mean of its divisors is an integer number (1403892).

Almost surely, 2^70657440 is an apocalyptic number.

70657440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70657440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134773632).

70657440 is an abundant number, since it is smaller than the sum of its proper divisors (198889824).

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

70657440 is a wasteful number, since it uses less digits than its factorization.

70657440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279 (or 1271 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 70657440 is about 8405.7979990005. The cubic root of 70657440 is about 413.4147486750.

The spelling of 70657440 in words is "seventy million, six hundred fifty-seven thousand, four hundred forty".