64975380 has 96 divisors (see below), whose sum is σ = 189815808. Its totient is φ = 16588800.

The previous prime is 64975373. The next prime is 64975409. The reversal of 64975380 is 8357946.

It is a happy number.

It is a super-2 number, since 2×64975380² = 8443600012288800, which contains 22 as substring.

It is a congruent number.

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, 336564 + ... + 336756.

It is an arithmetic number, because the mean of its divisors is an integer number (1977248).

Almost surely, 2^64975380 is an apocalyptic number.

64975380 is a gapful number since it is divisible by the number (60) 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 64975380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94907904).

64975380 is an abundant number, since it is smaller than the sum of its proper divisors (124840428).

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

64975380 is a wasteful number, since it uses less digits than its factorization.

64975380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 64975380 is about 8060.7307361058. The cubic root of 64975380 is about 402.0218052082.

Adding to 64975380 its product of nonzero digits (181440), we get a triangular number (65156820 = T₁₁₄₁₅).

The spelling of 64975380 in words is "sixty-four million, nine hundred seventy-five thousand, three hundred eighty".