55615620 has 48 divisors (see below), whose sum is σ = 161098560. Its totient is φ = 14318976.

The previous prime is 55615607. The next prime is 55615631. The reversal of 55615620 is 2651655.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14242 + ... + 17721.

It is an arithmetic number, because the mean of its divisors is an integer number (3356220).

Almost surely, 2^55615620 is an apocalyptic number.

It is an amenable number.

55615620 is an abundant number, since it is smaller than the sum of its proper divisors (105482940).

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

55615620 is a wasteful number, since it uses less digits than its factorization.

55615620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32004 (or 32002 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 55615620 is about 7457.5880819471. The cubic root of 55615620 is about 381.7088779063.

The spelling of 55615620 in words is "fifty-five million, six hundred fifteen thousand, six hundred twenty".