55073730 has 32 divisors (see below), whose sum is σ = 137925504. Its totient is φ = 14047616.

The previous prime is 55073729. The next prime is 55073747. The reversal of 55073730 is 3737055.

It is a super-2 number, since 2×55073730² = 6066231472225800, which contains 22 as substring.

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, 39219 + ... + 40598.

It is an arithmetic number, because the mean of its divisors is an integer number (4310172).

Almost surely, 2^55073730 is an apocalyptic number.

55073730 is an abundant number, since it is smaller than the sum of its proper divisors (82851774).

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

55073730 is a wasteful number, since it uses less digits than its factorization.

55073730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79850.

The product of its (nonzero) digits is 11025, while the sum is 30.

The square root of 55073730 is about 7421.1676978761. The cubic root of 55073730 is about 380.4651045522.

The spelling of 55073730 in words is "fifty-five million, seventy-three thousand, seven hundred thirty".