65400990 has 16 divisors (see below), whose sum is σ = 156962448. Its totient is φ = 17440256.

The previous prime is 65400977. The next prime is 65400997. The reversal of 65400990 is 9900456.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65400997) 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, 1089987 + ... + 1090046.

It is an arithmetic number, because the mean of its divisors is an integer number (9810153).

Almost surely, 2^65400990 is an apocalyptic number.

65400990 is an abundant number, since it is smaller than the sum of its proper divisors (91561458).

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

65400990 is a wasteful number, since it uses less digits than its factorization.

65400990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180043.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 65400990 is about 8087.0878565773. The cubic root of 65400990 is about 402.8976870028.

The spelling of 65400990 in words is "sixty-five million, four hundred thousand, nine hundred ninety".