77215040 has 56 divisors (see below), whose sum is σ = 210141312. Its totient is φ = 26472960.

The previous prime is 77215009. The next prime is 77215043. The reversal of 77215040 is 4051277.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77215043) 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, 14996 + ... + 19475.

Almost surely, 2^77215040 is an apocalyptic number.

77215040 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77215040 is an abundant number, since it is smaller than the sum of its proper divisors (132926272).

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

77215040 is a wasteful number, since it uses less digits than its factorization.

77215040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34495 (or 34485 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 77215040 is about 8787.2088856474. The cubic root of 77215040 is about 425.8277570034.

The spelling of 77215040 in words is "seventy-seven million, two hundred fifteen thousand, forty".