55297740 has 24 divisors (see below), whose sum is σ = 154833840. Its totient is φ = 14746048.

The previous prime is 55297717. The next prime is 55297741. The reversal of 55297740 is 4779255.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (55297741) 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, 460755 + ... + 460874.

It is an arithmetic number, because the mean of its divisors is an integer number (6451410).

Almost surely, 2^55297740 is an apocalyptic number.

It is an amenable number.

55297740 is an abundant number, since it is smaller than the sum of its proper divisors (99536100).

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

55297740 is a wasteful number, since it uses less digits than its factorization.

55297740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921641 (or 921639 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 39.

The square root of 55297740 is about 7436.2450201698. The cubic root of 55297740 is about 380.9802484921.

The spelling of 55297740 in words is "fifty-five million, two hundred ninety-seven thousand, seven hundred forty".